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My son is always full of and hardly feels tired.
A．force
B．energy
C．strength
D．power
He is always full of as though he never knows tiredness.
A．force B．energy C．strength D．power
This rule will come into ________ next week．
B．power
D．energy
Heat is a form of ________．
A．power
B．force
Heat is a form of ________ .
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